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- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/vmalloc.h>
- #include <linux/zlib.h>
- #include "internal.h"
- static z_stream stream;
- static int initialized;
- int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen)
- {
- int err;
- stream.next_in = src;
- stream.avail_in = srclen;
- stream.next_out = dst;
- stream.avail_out = dstlen;
- err = zlib_inflateReset(&stream);
- if (err != Z_OK) {
- pr_err("zlib_inflateReset error %d\n", err);
- zlib_inflateEnd(&stream);
- zlib_inflateInit(&stream);
- }
- err = zlib_inflate(&stream, Z_FINISH);
- if (err != Z_STREAM_END)
- goto err;
- return stream.total_out;
- err:
- pr_err("Error %d while decompressing!\n", err);
- pr_err("%p(%d)->%p(%d)\n", src, srclen, dst, dstlen);
- return -EIO;
- }
- int cramfs_uncompress_init(void)
- {
- if (!initialized++) {
- stream.workspace = vmalloc(zlib_inflate_workspacesize());
- if (!stream.workspace) {
- initialized = 0;
- return -ENOMEM;
- }
- stream.next_in = NULL;
- stream.avail_in = 0;
- zlib_inflateInit(&stream);
- }
- return 0;
- }
- void cramfs_uncompress_exit(void)
- {
- if (!--initialized) {
- zlib_inflateEnd(&stream);
- vfree(stream.workspace);
- }
- }
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